Method for evaluating bending rigidity damage degree of plate girder bridge plate

Abstract

The invention relates to a method for evaluating the bending rigidity damage degree of a plate girder bridge middle plate. According to the mutual interaction and the influence of the bending rigidity of each plate, the hinge joint rigidity and the displacement of each plate edge on the plate bending rigidity damage degree, a relationship formula among the bending rigidity, the hinge joint rigidity and the displacement of each plate edge is built, a plurality of loads and the load eccentricity are considered, and the bending rigidity damage degree of the plate is quantificationally judged through calculating the damage coefficient Beta i of each plate; when the Beta i is equal to 1, the plate is undamaged, and when the Beta i is equal to 0, the plate is completely damaged. The method has the advantages that the bending rigidity damage degree of the plate can be quantificationally judged, the influence of subjective factors is avoided, the method is applicable to the automobile loading, and the optimal estimation value of the bending rigidity parameters of the plate is given out according to several groups of experiments.

Description

technical field [0001] The invention relates to a method for evaluating the damage degree of the flexural rigidity of a slab girder bridge slab, belonging to the technical field of bridge structure evaluation in civil engineering. Background technique [0002] The slabs of the prefabricated slab girder bridge are prefabricated, and the slabs are connected by hinge joints. For slab girder bridges, damage generally occurs at the hinge joints first. With the further development of the damage, especially when the slab girder enters the single-slab stress state, the slab itself will also be damaged. Therefore, the damage of the hinge joint and the damage of the slab will exist at the same time. The damage of the board is generally reflected in the bending stiffness of the board, and has little influence on the torsional stiffness. The damage of the board in the present invention refers to the damage of the bending rigidity of the board. The damage of the slab has a great influe...

AI Technical Summary

Problems solved by technology

For the evaluation of hinge joint damage, the visual method is generally used in engineering, and the damage degree of the hinge joint is judged by manually checking whether the hinge joint is cracked or water seepage. reliable

The applicant once proposed "a method for evaluating the damage degree of hinge joints of slab girder bridges" (CN201210062742.8). This method has high accuracy for the evaluation of hinge joint damage, but this method cannot evaluate the damage degree of slabs

In engineering, the damage of the board is generally observed visually, but it is difficult to give the degree of damage, and the judgment is highly subjective

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